McGowan & Rodriguezâ€™sÂ sexy time wasÂ infamousÂ among the castÂ & crew of the movie, as the two would often have private “lunches” together in Robert’s trailer.

When Rodriquez’s wifeÂ (& mother to his five children) found out about the extramarital affair,Â she freaked out & left Robert where his greasy self stood.Â Apparently filming for the double feature literallyÂ halted for a month as theÂ director’s personal life fell apart.Â Â

Rodriguez and his spouse of 16 years, Elizabeth Avellan, raised five kids and worked together, with Elizabeth serving as his co-producer on â€œGrindhouse,â€ â€œSin City,â€ â€œFrom Dusk Till Dawn,â€ â€œDesperadoâ€ and â€œSpy Kids.â€

But the marriage exploded last April when Page Six reported that Rodriguez, 38, had begun a torrid romance with McGowan, the raven-haired, French-Irish minx once engaged to shock rocker Marilyn Manson and previously linked with Kip Pardue, Ahmet Zappa and Menâ€™s Health stud Dave Zinczenko.

â€œIt was the worst-kept secret on the set. They were going off to his trailer, having meals together,â€ our source said. â€œRose thought some of the crew were treating her differently, and the attitude was, like, well what do you expect when youâ€™re [bleeping] the director?â€

In â€œGrindhouse,â€ Rodriguezâ€™s homage to the cheesy sex-and-violence movies of the 1970s, McGowan plays a stripper who loses her leg and replaces it with a machine gun to battle flesh-eating zombies.

She and Rodriguez first met at Cannes in 2005. But until now the consequences of their shenanigans werenâ€™t fully known. When the director â€œfell in love with his femme-fatale star . . . he broke up his marriage of 16 years . . . The production had to shut down for a month while he recovered,â€ Variety reports.

Sluttypants McGowan, seems like thatÂ new nickname might be around for a bit, eh?